Information regarding Linq select function

Question

I have a list of strings. For instance, the list is {"AbcXYZZ","DEFG","HIJKL","MNOPQR"}. I want to check if the current string's length is greater than 4, then it will divide string into N substrings(strings of length 4). The final output should be like this: {"AbcX","YZZ","DEFG","HIJK","L","MNOP","QR"}

I can use select function to process the pipeline, but I could not think of a way to add the substrings just after the parent string. Any help is appreciated

You are going to have a problem processing the original collection while you also change the contents. — Ňɏssa Pøngjǣrdenlarp, Aug 21 '22 at 22:59
I am working on a pipeline that I cannot copy and then process. I have to work on the original — Ali Ahmad, Aug 21 '22 at 23:14

score 0 · Accepted Answer · answered Aug 21 '22 at 23:05

0

Try using SelectMany.

For splitting the strings I used the answer found here.

var list = new List<string> { "AbcXYZZ", "DEFG", "HIJKL", "MNOPQR" };

var output = list.SelectMany(x => x.Length > 4 ?
    _split(x, 4) :
    new string[] { x });

static IEnumerable<string> _split(string str, int chunkSize) =>
    Enumerable
        .Range(0, (str.Length + chunkSize - 1) / chunkSize)
        .Select(i => str.Substring(i * chunkSize, Math.Min(str.Length - (i * chunkSize), chunkSize)));

Console.WriteLine(String.Join(";", output));

outputs:

AbcX;YZZ;DEFG;HIJK;L;MNOP;QR

answered Aug 21 '22 at 23:05

stuzor

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This is perfect for my use case. Can you explain this code a bit? – Ali Ahmad Aug 21 '22 at 23:13
Select operates on an enumerable set of items, allowing you to process each item in the set and return a single object for each. SelectMany also operates on an enumerable set of items, but allows you to return multiple values for each item in the set, and the return value from SelectMany aggregates all the values into a single return set. – stuzor Aug 23 '22 at 06:36

Information regarding Linq select function

1 Answers1